Indlela yokukhetha nokuthenga
Uma uthenga ifilimu yokudla noma ukugoqa kwepulasitiki, qiniseka ukuthi ubheka igama elithile noma isakhiwo samakhemikhali, futhi uqaphele uma umkhiqizo unegama lesiNgisi kuphela futhi ungenalo uphawu lwesiShayina.Futhi, qiniseka ukuthi ukhetha imikhiqizo ephawulwe ngamagama athi "okudla".
Kunezinhlobo ezimbili eziyinhloko zefilimu yokudla: i-polyethylene (PE) ne-polypropylene (PP).Umehluko wamanani phakathi kwemikhiqizo emibili awumkhulu, kodwa i-polypropylene (PP) ingcono ekumiseni ukungena kwamafutha.
Uma uthenga ifilimu yokudla, kunconywa okokuqala ukuthi uthenge ifilimu yokunamathela yokunamathela eyenziwe nge-polyethylene (PE), ikakhulukazi uma kuziwa ekulondolozeni inyama, izithelo, njll, ngoba i-PE iphephile kakhulu ngokuphepha.Ukuphila kweshelufu ende, i-polyvinyl chloride (PVDC) iyanconywa ngoba inezinto ezingcono zokugcina umswakama futhi ineshalofu ende kunazo zonke zezinhlobo ezintathu zefilimu yokudla.Ifilimu yokudla ye-Polyvinyl chloride (PVC) iphinde ikhethwe abantu abaningi ngenxa yokungafihli kahle kwayo, i-viscosity, ukunwebeka kanye nentengo eshibhile, kodwa kufanele kuqashelwe ukuthi ayikwazi ukusetshenziselwa ukugcina ukudla okunamafutha ngoba iyinhlaka eyakhiwe nge-polyvinyl chloride. i-resin, i-plasticizer kanye ne-antioxidant, yona ngokwayo engenabuthi.Kodwa-ke, ama-plasticizers nama-antioxidants angeziwe anobuthi.Amapulasitiki asetshenziswa epulasitiki ye-PVC ukuze asetshenziswe nsuku zonke ikakhulukazi i-dibutyl terephthalate ne-dioctyl phthalate, okungamakhemikhali anobuthi.Lokhu kunomphumela olimaza kakhulu ohlelweni lwe-endocrine lomuntu futhi kungaphazamisa ukwakheka kwehomoni yomzimba.I-lead stearate, i-polyvinyl chloride antioxidant, nayo inobuthi.Imikhiqizo ye-PVC equkethe ama-antioxidant anosawoti omthofu inyusa umthofu lapho ihlangana ne-ethanol, i-ether nezinye izincibilikisi.I-PVC equkethe usawoti omthofu osetshenziswa njengokupakishwa kokudla kanye nama-donuts, amaqebelengwane athosiwe, izinhlanzi ezithosiwe, imikhiqizo yenyama ephekiwe, amaqebelengwane kanye nokudla okulula kuhlangana, kuzokwenza ama-molecule okuhola ahlakazeke kugrisi, ngakho awukwazi ukusebenzisa izikhwama zepulasitiki ze-PVC ngokudla okuqukethe amafutha.Ngaphezu kwalokho, akukho ukushisisa kwe-microwave, akukho ukusetshenziswa kwezinga lokushisa eliphezulu.Ngoba imikhiqizo yepulasitiki ye-PVC izobola kancane kancane igesi ye-hydrogen chloride emazingeni okushisa aphakeme, acishe abe ngu-50℃, futhi le gesi iyingozi emzimbeni womuntu, ngakho imikhiqizo ye-PVC akufanele isetshenziswe njengokupakisha ukudla.
Ububanzi bokusetshenziswa
Ukuhlola kubonisa ukuthi amagremu angu-100 e-leek egoqwe ngopulasitiki, ngemva kwamahora angu-24 okuqukethwe kukavithamini C kungu-1.33 mg ngaphezu kwalapho kungasongiwe, kanye no-1.92 mg ngaphezulu kokudlwengulwa namahlamvu ulethisi.Nokho, imiphumela yokuhlolwa kweminye imifino yayihluke kakhulu.Amagremu angu-100 esithombo esongwe ngepulasitiki agcinwe usuku, futhi okuqukethwe kwawo kwevithamini C kwehliswa ngo-3.4 mg, ubhontshisi we-curd ngo-3.8 mg, futhi ukhukhamba wagcinwa usuku nobusuku, futhi ukulahlekelwa kwe-vitamin C kwakulingana 5 ama-aphula.
Ukudla okuphekiwe, ukudla okushisayo, ukudla okunamafutha, ikakhulukazi inyama, kungcono ukungasebenzisi isitoreji sokugoqa epulasitiki.Ongoti bathi uma lokhu kudla kuhlangana nefilimu yokudla, amakhemikhali aqukethwe kule ndaba angahwamuka kalula futhi ancibilike ekudleni, okungaba yingozi empilweni.Iningi lefilimu yokudla ethengiswa emakethe lenziwe nge-vinyl masterbatch efanayo nezikhwama zepulasitiki ezivame ukusetshenziswa.Ezinye izinto zefilimu yokunamathela ziyi-polyethylene (PE), engenawo ama-plasticizers futhi iphephile uma isetshenziswa;ezinye i-polyvinyl chloride (PVC), evame ukuhlanganisa izinto zokuzinzisa, izinto zokugcoba, ama-axiliary processors nezinye izinto ezingavuthiwe ezingaba yingozi kubantu.Ngakho-ke, kufanele uqaphele ekukhetheni.
Isikhathi sokuthumela: Mar-16-2022